11:57 p.m.

The excessive heat warning for Douglas County expired at 10 p.m. as scheduled. The temperature had dropped to 83 degrees, and the heat index to 90, by 10:52 p.m.

The NWS expects heat indices to reach between 103 and 109 degrees Monday, with a high temperature of 100.

8 p.m.

The excessive heat warning for Douglas County, originally set to expire at 8 p.m., has been extended until 10 p.m. A heat advisory remains in effect until 8 p.m. Monday.

It was 96 degrees at the Lawrence Municipal Airport as of 6:52 p.m. with a heat index of 120 degrees and 64 percent humidity, according to the National Weather Service.

4:15 p.m. update

At 3:52 p.m., The National Weather Service in Topeka reported that the temperature in Lawrence had topped 100 degrees, making this the hottest day of the year so far.

The heat indices were much higher, as high as 115 degrees at times. In Topeka, heat indices of 120 were reported.

Outdoor activity is not recommended while temperatures remain this high.

Check back to LJWorld.com for updates.

12:07 p.m. update

As the mercury climbs, the National Weather Service in Topeka has issued an excessive heat warning for Douglas County and all the rest of northeast Kansas through 8 p.m. Sunday night.

According to the weather service, heat indices, or the temperature it feels like outside, are expected to range from 108 to 113 degrees. Exposure to the heat could lead to heat cramp, heat exhaustion or heat stroke, the weather service said.

The weather service urges you to consider rescheduling outdoor activity until after the excessive heat warning is listed. If that’s not possible, remember to drink plenty of fluids and wear light-colored, loose-fitting clothing.

For more tips on avoiding and treating heat-related illnesses, check out this post from WellCommons.

An excessive heat warning is issued when high humidities are expected to combine with hot temperatures to make it feel like it is 110 degrees or greater.

The heat advisory remains in effect through 8 p.m. Monday.

2 a.m. update

A heat advisory for Douglas County issued by the National Weather Service in Topeka will go into effect at 11 a.m. today.

Temperatures during the heat advisory, which will last through Monday evening, are expected to rest between 95 and 103 degrees. High humidity levels will make the temperatures feel warmer, topping out near 108 degrees.

Heat-related illness is possible for individuals who are exposed to the conditions for prolonged periods of time. Residents planning to spend time outside should avoid strenuous activities, wear light, loose-fitting clothing and of course drink plenty of water.